<template>
	<view>
		<view class="search-box">
			<uni-search-bar @input="input" :radius="17" cancelButton="none" ></uni-search-bar>	
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResult.length !== 0">
			<view class="sugg-item" v-for="(item,i) in searchResult" :key="i" @click="gotoDetail(item)">
			<view class="goods-name">{{item.goods_name}}</view>
			<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 搜索标题 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click='clean'></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag class="uni-tag" :text="item" v-for="(item,i) in histories" :key="i" @click="getGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				// 关键词
				kw:'',
				// 搜索结果列表
				searchResult:[],
				// 搜索历史数据列表
				historyList:[]
			};
		},
		onLoad() {
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods:{
			// input 输入事件
			input(e){
				
				clearTimeout(this.timer)
				
				this.timer = setTimeout(()=>{
					this.kw = e.value
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				if(this.kw == ""){
					// 如果关键词为空，说白了没输入，或者清空了搜索关键词，那么就清空搜索结果列表
					this.searchResult =[]
					return 
				}
				
				const res = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})	
				if(res.data.meta.status !== 200) return uni.$showMsg()			
				this.searchResult = res.data.message

				this.saveSearchHistory()
			},
			gotoDetail(item){
				uni.navigateTo({
					url:"/subpkg/goods-detail/goods-detail?goods_id="+item.goods_id
				})
			},
			saveSearchHistory(){
				
					
					const set = new Set(this.historyList)
					
					set.delete(this.kw)
					
					set.add(this.kw)
					
					this.historyList = Array.from(set)
				
					// 对搜索历史数据进行持久化的存储
					
					uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			getGoodsList(kw){
				uni.navigateTo({
					url:"../goods_list/goods_list?query=" + kw
				})
			}
		},
		computed:{
			histories(){
				
				return [...this.historyList.reverse()]
				
			}
		}
	}
</script>

<style lang="scss">
.search-box{
	// 下面三个为吸顶效果的属性
	position: sticky;
	top: 0;
	z-index: 999;
}
.sugg-list{	
	padding: 0 5px;
	
	.sugg-item{
		display: flex;
		// 纵向居中
		align-items: center;
		// 横向均匀排列每个元素首个元素放置于起点，末尾元素放置于终点 
		justify-content: space-between;
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		
		.goods-name{
			// 文字不允许换行
			white-space: nowrap;
			// 超出的部分隐藏
			overflow: hidden;
			// 文本溢出后使用 ... 代替
			text-overflow: ellipsis;
			margin-right: 3px;
		}
		
	}
}
.history-box{
	padding: 0 5px;
	
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	
	.history-list{
		display: flex;	
		flex-wrap: wrap;
		
		.uni-tag{
			margin-top: 5px;
			margin-right: 5px;
		}
	}
}

	
</style>
